Well... I know this question has been asked several times, and I have not found an answer other than "It is explained in the readme".

Now, in the Hydroball readme, it explains the entities. The problem is, I have no clue as to how to use these entities in a map. I have changed my fs_game in the project settings to hydroball, and there is no entities.def file for Hydroball, to my knowledge.

Could someone explain in detail how to use the entities required to make a Hydroball map?